My experiences with burning cd's on a 68030 are these ...
1) an IDE controller is indeed necessary. I had a Powerflyer with 20 Gb hd and a scsi Plextor 4x2x20 and 96 Mb of Ram from which 85 Mb was used as buffer. If you plan on burning lotsa small files of games or demo's then a lot of buffer is needed.
2) an IDE rewriter needs to be able to burn at a speed of 4 or slower. After my Plextor I had a Philips model 803 8x4x32 but it refused to burn at a speed that I wanted it to burn and so it burned at maximum speed, which meant that the burning process consumed to much processor power that the harddrive could not keep the buffer full enough and so I got only buffer underruns. I tried to burn CDRW's at a maximum speed of 4 and this worked fine.
3) to burn from scsi to scsi is the easiest. If you don't have both, try to get one of them, like a scsi hd and a ide rewriter or vice versa.
